Improvement in tubular grate-bars



WILLIAM mm. Improvement in Tubular Grate-Bars. 114,280

Patented May 2,1871.

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WILLIAM H.'FARRIS,

OF CAIRO, ILLINOIS.

Letters Patent No. 114,230, dated May 2,1871.

IMPROVEMENT IN TUBULAR GRATE-BARS- The Schedule referred to in these Letters Patent: and making part of the same.

To all whom it may concern Be it known that I, WILLIAM H. FARRIS, of Gairo, in the county of Alexander and State of Illinois, have invented an Improvement in GrateeBai-s and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making a part of this specification, in which- Figure 1 is a perspective view of the grate bars connected together as I use them.

Figure 2'is a diametrical section through one of the bars and its fire-back.

-Figure 3 is a side view of a grate-bar and fire-back with a section broken out.

Figure 4 is a vertical section taken transversely through the fire-bricks.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to certain novel improvements on grates for steam-boiler furnaces, wherein hollow grate-bars are employed which are in communication with the water-space of the boiler so that wa her will circulate through the bars.

The nature of my invention consists-- First, in the construction of a hollow grate-bar upon one end of a fire-back, into which latter a small pipe is secured which receives water from a chamber in the back that communicates with the water-space of the boiler, and whichfldischarges water into the hollow grate-bar and thence through said fire-back into the boiler again, as will be hereinafter explained.

Second, in the combination, of a hollow grate-bar, an internal pipe or tube, and a fire-back, which latter is constructed with an'inlet-pipe and an outlet-pas- .sage or grate-bar proper, as will be hereinafter explained.

Third, in the combination, with a hollow grate-bar and a chambered fire-back, of an internal pipe or conduit and a cap to the free end of the grate-bar, as

will be hereinafter explained.

Fourth, in the combination of a series of hollow grate-bars and chambered fire-backs, connected'together, and constructed in such manner that the inlet and discharge of water shall be through each fireback, as will be hereinafter explained.

To enable others skilled in the art to understand my invention I will describe it.

In the accompanying drawing, fig. 1, I have represented ten of my rate-bars connected together and provided with an inlet-pipe, O, for communicating withthe water-space of a steam-boiler, and an outletpipe, ii, for communicating with the steam-boiler near the water-line thereof. The bars are all constructed alike, so that a clear understanding of them can be given by description of one bar and its'connections.

A represents a fire-back which is constructed with openings i i communicating with a chamber, 3, and also with openings '6 i communicating with an inclined passage, f.

Externally and on one side of the fire-back the openings it are surrounded by annular sockets n n for receiving short tubes 6 c, which are formed on a fire-back that lies adjacent to this back, as shown in fig.4. 0n the opposite side of the fire-back tubes- Within the hollow grate-bar B is a tube, G, one

end of which is screwed fast into the fire-back A so as to communicate with the inlet-passage s; the other'end of thepipe G terminates within a short distance of the cap D, as shown in fig. 2.

' By means of a bolt, 12, with'nuts on its ends, the cap 1) and the grate-bar B are firmly confined in place and secured to the fire-back A.

- The packing or gaskets used at the joints may be made of India rubber, copper, or of any other suita hle material 'whichwill make tight joints.

. The bolt (1. passes through all of the fire-backs and through an elbow, c, and through the pipe 0. The bolt 0. passes through all of fire-backs through a pipe, 0', and through an elbow, c. In this way two bolts unite all the sections of the grate together transversely.

It will be seen from the above description that each grate-bar is free to expand and contract longitudinally independently of the others; also,- that when the pipes G G are connected to a steam boiler,

as above set forth, thechambers and passages in the grate will he filled with water.

When fire is made on the grate and heat commuui catcd to the water therein, a circulation will be produced through each of the grate-bars, the direction of the currents being from thepassage s int-he fire-back A through the-internal pipe G, thence into the space between the grate-bar B and pipe G, and back again vided with a. hollow bar, B, and internal tube G, substnntially' as described.

2. The cap D, applied to the end of 'the hollow-bar B, in combination with the internal vtube G, terminating near said cap and communicating with the iulet passnge s, substantially as described.

3. A series of chambered fire-backs, A, communicat ing above and below with one another, in combination with grate-bars B, internaltubes G, andlcaps D, so

constructed and arranged that the inlet and discharge of water sha l be through each fii'e back and gratebar', substantially as described.

' WM. H. HARRIS.

Witnesses:

Z. N. CAMPBELL, EDM. 1*. BROWN.' 

